How To Count Selected Checkboxes Using jQuery

Author: erics, March 3rd, 2012

Just be sure to add the class “yourClass” to each checkbox in the group you wish to count and it is as simple as:

alert( 'Qty checked: ' + jQuery('.yourClass:checked').length );

1	alert( 'Qty checked: ' + jQuery('.yourClass:checked').length );

How To Check If An ID Exists Using jQuery

Author: erics, May 10th, 2011

Use the .length property:

if (jQuery("#yourDiv").length > 0){
    // your code here
}

if (jQuery("#yourDiv").length > 0){

// your code here

}